These structures prevent prolapse of the atrioventricular valves.
A. Chordae tendineae
B. Crista terminalis
C. Trabeculae carneae
D. Intercalated discs
Answer: A. Chordae tendineae
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Arrange the following events of coagulation in proper sequence.(1) Prothrombin ? thrombin(2) Fibrinogen ? fibrin(3) Activation of factor XII(4) Formation of prothrombinase
A. 1, 2, 3, 4 B. 2, 4, 3, 1 C. 4, 3, 1, 2 D. 3, 2, 4, 1 E. 3, 4, 1, 2
Red blood cells are formed by the process of ________.
Fill in the blank(s) with the appropriate word(s).
When acetylcholinesterase outlasts the release of acetylcholine from the synaptic vesicles, the skeletal muscle ________
A) contracts B) gets stronger C) relaxes D) opens its Na+ channels E) releases Ca++
The layer of the heart wall composed of cardiac muscle tissue is the
A. myocardium. B. endocardium. C. pericardial cavity. D. pericardium. E. pectinate muscle.